Cut back on driving by walking, biking or taking public transportation. Start a carpool with your coworkers, classmates or friends. Keep your car tuned up and your tires properly inflated. Giving your engine a tune-up can improve gas mileage by more than 4%. Replacing a clogged air filter can boost efficiency by 10%. And keeping your tires properly inflated can improve gas mileage by more than 3%. When purchasing a car, choose a fuel efficient vehicle. Fly less and purchase "Carbon Offsets" to balance out your travel. Travel Green. When going on vacation or on a business trip, take your "green principles" with you. Back to previous page.